444402421 has 4 divisors (see below), whose sum is σ = 444906592. Its totient is φ = 443898252.

The previous prime is 444402407. The next prime is 444402443. The reversal of 444402421 is 124204444.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 444402421 - 2²⁵ = 410847989 is a prime.

It is a super-2 number, since 2×444402421² = 394987023581322482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444402401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250761 + ... + 252526.

It is an arithmetic number, because the mean of its divisors is an integer number (111226648).

Almost surely, 2^444402421 is an apocalyptic number.

It is an amenable number.

444402421 is a deficient number, since it is larger than the sum of its proper divisors (504171).

444402421 is an equidigital number, since it uses as much as digits as its factorization.

444402421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504170.

The product of its (nonzero) digits is 4096, while the sum is 25.

The square root of 444402421 is about 21080.8543707318. The cubic root of 444402421 is about 763.1187751931.

Adding to 444402421 its reverse (124204444), we get a palindrome (568606865).

The spelling of 444402421 in words is "four hundred forty-four million, four hundred two thousand, four hundred twenty-one".